Saw-sharpening machine.



No. 654,844. Patented July 3!, I900.

H. P. SCHOFIELD.

SA W SHABPENING MACHINE.

(Application filed Mar. 24, 1900.)

(No Model.) 4 SheetsSheet No. 654,844v Patented luly 3|, I900.

H. P. SCHOFIELD.

SAW SHARPENING MACHINE.

(Application filed Mar 24, 1900.) (No Model.) 4 Sheets-$heet 2.

l lllllllllllllllll No. 654,844. Patented July 31, I900. H. P. SGHOFIELD.

SAW SHARPENING MACHINE.

(Application filed MBA. 24, 1900.1 (No Model.) 4 Sheets-Sh6ei 3.

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N01 654,844. Patented .Iuly 3|, I900.

H. P. SCHOFIELD.

S AWTSHABPENING MACHINE.

(Alpfilication filed Mar. 24. 1900.!

No Model.)

4 Shanty-Sheet 4.

w 21 1mm mmil E T 5 mm STATES PATENT omits.

HENRY P. sononIELD, OF ornoneo, 1LL1N O IS, Assienon or ONE-HALF To 1 L. L. FILS'IRUP, or SAME PLACE.

.HSAW-SHARPENVING MACHINE? M srnomlcarro v forming part of LettersPat'ent No. 654,844, dated July 31, who; 7 I A plication filed March 24, 1900. Serial No. 9,999. ,(No model.)

the grinding operation.

My object is to provide a construction I feed mechanism wherein the parts which are peculiarly subject to wear are readily replace able, being preferably made of hardened steel.

The accompanying drawings illustrate my improvements in connection with 'so much of a saw-sharpening machine as is necessary for illustration, a novel form ofsaw support or guide being shown, however, the same being claimed in my application, Serial No."9,9 98,

2 5 filed oneven date herewith..

In the drawings, Figure 1 is a view in front. elevation of a saw-sharpening machine of a well-known general form of construction, but

equipped with-the improved guide mentioned and theimproved feed mechanism hereinafter described. Fig. 2-is a vertical section par allel to the front of the machine and taken as indicated at line 2 of Fig. 3; Fig. 3, a plan section taken as indicated at line 3 of Fig. 2;

Fig. 4, a view in front upper perspective showing that portionof the feed' mechanism which isadjacent to the saw and an adjustable stop for the same; Fig. 5;a plan view of the mechanism shown in Fig. 4; Fig. 6, a

vertical section parallel to the front of the machine and taken as indicated at line 6 of Fig. 5; Fig. 7, a transverse section at line 7 of Fig. 4;; Fig. 8, a broken detail showing the method of adjustment for the feed-arm; Fig. 9, a transverse section on line 9 of Fig. 8; Fig. 10, asimilar section on line 10 of Fig. 8; Fig. 11, a detail of the weightactuated device Which serves to retract the feed-finger after the forward movement; and Fig. 12, an enlarged sectional detail of the block or plate bears, as shown in Fig. 4. I p A represents the frame of the machine; A A uprights thereof; A cross-braces thereof; B, a support or guide for the saw; 0, a

upon which the arm carryingthe feed-finger fragment of the saw; D, a pivoted guide-plate; D, a pivoted spring or hasp for yieldingly holding the guide B against a saw; E, an adjustable frame or guide for the grindingthe gate-moving mechanism and with a cam 11 for actuating the feed mechanism; I, a rock-arm pivoted at its lower end atb through the frame and provided with a roller 1), en-

gaging the cam H J, an adjustableconnecting-rod joining the upper portionof the rockarm I to the lower end of a pivoted-feed-lever J; K, a rock-shaft pivoted 'in ,the frame in jbearings c and to which the, feed-lever J is fixed; L, a rock-arm pivoted .to theframe at titslower end at a point at and-providedwith a branch arm L, having an adjustable weight L L a link fixedly secured: to, the shaft K and having bolt connectionewitha slot e in the upper end of the arm L, the arm L being itself provided with a slot 6? to make the bolt e adjustable thereon; M, an adjustable feed-arm having pivotal connection with the upper end of the feed-lever J; N, an adjustable stop for said feed-arm; P P, tight and loose pulleys on a shaft P through which power is applied to the machine from any suitable line-shafting, and l? a cone'pulley which has indirect connection with thegrinding-wheel gate-as, for instance, shown in the reissue patent to Filstrup, No. 11,7 33," granted April 11, 1899. i

No features of novelty are claimed in the present application except those relating to the feed mechanism and the adjustable stop for the feed-arm.

The rock-arm F serves when actuated by tion of the stem with the sleeve k the cam H to move the grinding-wheel gate in the ordinary manner. The cam H serves, through the medium of the roller 1), the rockarm- I, the connecting-rod J, and the feed-lever J, to move the feed-arm M in a direction to advance the saw toward the left in Fig. 1. The weight L serves, through the medium of the rock-arm L and the link L to rock the shaft K in a direction to throw the upper end of the lever J toward the right, and in consequence, through the medium of the connecting-rod J, to move the upper end ofthe rock-arm I toward the left, thereby holding the roller 1) always firmly in contact with the cam H The connection between the rod J and the rock-arm I is a boltf, and, as shown, the rock-arm projects above this bolt and is provided with a perforation f,wi th which the rod may be joined, if desired, to vary the throw. The connection between the rod J and the lower end of the lever Jis a bolt 9, carried by the end of the rod, and a slot g, with which theleveris provided, thereby permitting adjustment.

' As shown in Fig. 9, the upper end of the lever J is, provided with a circular head h, while the feed-arm M, as shown in Figs. 5 to 9, inclusive, is adjustably connected with a pivotal connecting member h, having a vertical face which contacts with the vertical face of the head It, a circumferential flange 7L which houses the head h, a stud h which pro is connected'to'said head by a washer h and screw h 'anda cylindrical-or sleevelike portion it, with which the stem of the feed-arm I M is adj ustably connected. The stem of the feed-arm M-passes through the sleeve h and has a reduced portion is, which passes through an adjusting-sleeve k, having threaded connection with the interior of the sleeve 71. and provided with a knob or head 10 for adjustment. -A nut 10 connects the reduced por- The stem of the arm M is of a general circularcrosssection, as shown in Fig. 10; but with a flat upper surface, upon which bears a downturned end of a spring the rear. end of which is connected by a screw 10 to a boss 70 on the, sleeve 72 Ascrew7c passing through the spring 70 a short distance from the screw 70 and into the sleeve h, serves to cause the free end of the spring to bear upon the flat surface of the stern M and lock the stem against movement. With this construction it is only necessary to loosen the screw Z0 to permit the sleeve 70' to be turned in or out,

thereby causingthe arm M to move with it the reduced portion'k of the arm M, permitting the sleeve 70 to'rotate readily upon it.

' The front portion of the arm M consists of a flattened horizontal part Z at an angle to the stem of the arm, a hardened replaceable steel pin 1', affording a feed s-finger, a hardenedsteel bearingsblock Z which slides upon the upper surface of the front end of the machineframe,a hardened-steel block Z recessed, as

block m is secured to the block 'm by having one-of its beveled ends project beneath a corresponding beveled surface in the block m and its other beveled surface beneath the corresponding beveled surface on a block m let .into a recess in the block m and having a second beveled surface m which engages a corresponding beveled surface m all as clearly shown in Fig. 12. A screw 'rn passes through the block m and intothe block m and the block 121 rests upon its inclined surfaces and does not bear at its lower surface on the bottom of the recess in which it is placed. It will thus be seen that when the screw m is turned down the block 9% serves as a Wedge to force the block m against the projecting beveled surface of the block m at theopposite end of the block m.

The stop N comprises a part n, secured to the upper surface of the front end of the frame by bolts n and provided with a channel 72 an adjustable stop a moving in the channel 01 and provided at one end with a stop-finger n and at the opposite end with a beveled surface M, an adj usting-screw n ,hav in g threaded connection with a perforation in the part n and bearing at its lower end against the bev-.

- a slot 71 in which the vertical heel or M g n of the adjustable stop moves. From the foregoing description it appears that the stop u is adjustable and replaceable; that the feed-arm M is readily adjustable and provided with the replaceable hardened-steel bearing-strips Z and Z the former of which is subject to a great deal of wear, as it bears upon the horizontal block m, and the latter of which is subject to great wear, as it bears upon the vertical rear surface of the block m, and,

finally, that the lever and link mechanism for moving the feed-arm M is readily adjust able. It further appears that the pivotal connection between the feed-arm M and the upper end of the lever J is protected by the flange k projecting over the headh.

In operation the sawis I60. across the front of the machine through the guide '3 by the feed mechanism described, while the grinding-wheel is caused to grind the teeth one by one as it is moved along their surfaces by the grinding-wheel gate in the usualfmanner. In the operation of feeding the saw it will be observed that a force is exerted upon the feedfinger Z, tending to turn the free end of the feed-arm toward the saw and that a reacting force between the block m and the block Z preserves the feed-arm in proper alinement and prevents a binding force from being exerted at the pivotal connection at the upper end of the feed-arm-actuating lever.

What I claim as new, and desire to secure by Letters Patent, is

1. In a saw-sharpening machine, the combination with a frame, a grindingwheel gate, a grinding-wheel, andmechanism for moving the grinding wheel gate and turning the grinding-wheel, of feed mechanism comprising a rock-arm, a rotating shaft provided with a cam engaging said rock-arm, a rock-shaft, a lever connected with said rock-shaft, a connecting-rod joining said lever to the rockarm engaging said cam, a feed-arm pivotally connected with the free end of said lever and provided with a feed-finger, a pivoted arm, a Weight connected therewith, and connecting means between said pivoted arm and said rock-shaft, whereby said weight tends to rotate said rock-shaft to retract the feed-arm and cause the rock-arm engaging said cam to remain in contact with said cam, substantially as and for the purpose set forth.

2.' The combination in a saw-sharpening machine, of a frame, a rockshaft pivoted therein, a feed-lever connected with said rockshaft to rotate therewith, a feed-arm pivotally connected with the upper end of said lever and provided with a feed-finger, a rotating shaft provided with a cam, a rock-arm bearing against said cam, a connecting-rod joining said rock-arm to the lower end of said lever, a weight-bearing arm pivotally connected with the frame, and a link or arm con- .nected with said rock-shaft to rotate therewith, and having sliding connection at its free end with said weight-bearing arm, substantially as and for the purpose set forth.

3. In a saw-sharpening machine, having a frame, a grinding-wheel, means for moving the grinding-wheel, a guide for a saw, and a feed-arm and means for actuating said feedarm, said feed-arm being provided with a feed-finger-receiving perforation, a replaceable hardened-steel pin Z affording'a feedfinger, substantially as and for the purpose set forth.

4. In a saw-grinding machine, the combination with a frame provided at its front end with a bearing-block for a feed-arm, of a feed arrn provided with a feed-finger and with a bearing-block resting upon said block on the frame, and provided also with a block bearing against the inner vertical surface of the block on said frame, and means for actuating said feed-arm, substantially as and for the purpose set forth.

5. In a saw-grinding machine, the combination with a frame provided at its front end with a bearing-block for a feed-arm, of a feed-' arm provided with a feed-finger with-a replaceable horizontal bearing-block, and a replaceable vertical bearing-block serving to hold said horizontal bearing-block in place, substantially as and for the purpose set forth.

6. In a saw-sharpening machine, the combination with a frame provided at the upper surface of its front end with a projecting in clined surface, a replaceable bearing-block provided at its ends with inclined surfaces,

1 one of its ends contacting with said first-mentioned inclined surface, and a securing-block provided with an inclined surface bearing upon the inclined surface of the adjacent end of the bearing-block, a feed-arm provided with a feed-finger and moving upon said bearing-block, and means for actuating said feedarm, substantially as and for the purpose set forth.

7. In a machine for sharpening saws, the combination with a frame provided at the upper surface of its front end with a projecting beveled surface, a bearing-block provided bearing-surface and provided with a feed-- finger, an arm for actuating said feed-arm, 'a member pivotally connected to said lastnamed arm and provided with aperforation for the stem of the feed-arm, an adjustingsleeve having threaded connection with said pivotal connecting member and provided with a perforation through which the stem of said feed-arm passes, means for securing the stem of said feed-arm to said adjusting-sleeve to too" permit the sleeve to rotate on said stem, and

means connected with said pivotal member and bearing upon said stem for securing the feed-arm in a given position, substantially as and for the purpose set forth.

9. In a saw-sharpening machine, the com-- bination with a frame provided at its front end with a bearing-surface for a feed-arm, a feed-arm sliding upon said bearing-surface and provided with a-feed-finger, a feed-lever for actuating said feed-arm, a pivotal connecting member for joining said feed-arm to said actuating-lever, said pivotal member being provided with a perforation for the stem of the feed-arm, an adjusting-sleeve k having threaded connection with said pivotal connecting member and secured rotatably and non-movably longitudinally upon the stem of said feed-arm, and a spring k secured to said pivotal connecting member and bearing against the stem of said feed-arm, substantially as and for the purpose set forth.

10. In a saw-sharpening machine, the combination with a frame provided at its front end with a feed-arm bearing, a feed-arm sliding upon said bearing and provided with a feed-finger andprovided with a stem having a flattened upper surface and a reduced connected "therewith by a nut thereon and having threadedconnection with said pivotal connecting member, a spring attached to said pivotal connecting member and hearing at its free end on the flattened surface of said stem, and a screw for tightening said spring upon said stem, substantially as and for the purpose set forth.

' 11. In a saw-sharpening machine, the combination with a frame provided at its front end with a feed-arm bearing, a feed-arm M sliding upon said bearing and provided with a feed-finger, a feed-arm-actuating lever provided with a circular head it, and a connecting member h carrying said feed-arm and pivotally joined to the center of the head h and provided with a flange k inclosing said head, substantially as and for the purpose set forth.

12. In a saw-sharpening machine, the combination with a frame provided at its front end with a feed-arm bearing, a feed-arm M sliding upon saidbearing and provided with a feed-finger, a feed-arm-actuating lever providedwith a circular head h, a connectingmember 71/ carrying said feed-arm and providedwith a stud h projecting through the perforation in the head 71. and provided also with a flange h? embracing the head it, and means for securingthe member h to the head h, substantially as and for the purpose set forth. g v

13. In a saw-sharpening machine, the combination with a frame provided at its front end with a bearing for a feed-arm, a feed-arm sliding upon said bearing and provided with a feed-finger, means for actuating said feedarm, and an adjustablestop against which said feed-arm strikes comprising a member 1 fixedly securedto the frame and afiording a guide, a movablemember in said guide and projecting into the pathof said feed-arm at one end, and provided at the opposite end with an inclined surface, and an adjustingsubstantially as and for the purpose set forth.

14. In a saw-sharpening machine, the combination with a frame provided at its front end with a bearing for a feed-arm, a feed-arm sliding upon said bearing and provided with a'feed-finger, means for actuating said feed arm, and an adjustable stop comprising a member n' fixedly secured to the frame and provided with a guideway, and at the rear end of said guideway witha threaded perfo ration, a member 91 moving in said guideand provided at one end with a feed-arm-engag ing head and at the opposite end with an in= clined surface, and an adjusting-screw projecting through said perforation and against said inclined surface, substantially as and for the purpose set forth.

15. In a saw-sharpening machine, the combination with a frame provided at its front end with a bearing for a feed-arm, a feed-arm sliding upon said bearing and provided with a feed-finger, means for actuating said feedarm, and an adjustable stop comprising a fixed member 42 provided with a guide, a threaded perforation and a split lug M, a movable feed-arm engaging member a provided at one end with an inclined surface 02 an adjusting-screw projecting through said threaded perforation and through said split lug n", and a screw a serving to lock the adjusting-screw n, substantially as and for the purpose set forth.

16. In a saw-sharpening machine, the combination with a frame provided at its front endwith a bearing for a feed-arm, a feed-arm sliding upon said bearing and provided with a feed-finger, means for actuating said feedarm, and an adjustable stop comprising a fixed member '11., a movable feed-arm-engaging member 92 provided at its front end with a head n and-at its rear end with a head provided with an inclined surface a an adj usting-screw 12 passing through the perforation in the member at and bearing upon said inclined surface, a slotted lug embracing the stem of said adjusting-screw, a screw a for tightening said lug upon the stem of the adjusting-screw, and a screw n passing through the perforation in the member 77. and bearing upon the movable member 02 substantially as and for the purpose set forth.

HENRY P. SOHOFIELD. In presence of D. W. LEE,

A. vD. BACCI.

screw bearing upon said inclined surface, I 

